Watch British forces drop two 2,000-pound bombs on an ISIS camp in one of Saddam Hussein's old palaces

The major campaign to retake Iraq’s second largest city of Mosul from ISIS militants are in the works, and as part of it, coalition forces deemed it necessary to strike hard and fast.

A lavish palace, which once belonged to the late Saddam Hussein, was reported to have been used as a major training center for foreign ISIS recruits.

According to the UK’s Ministry of Defence (MoD), after conducting extensive surveillance, two Royal Air Force Tornadoes dropped the largest bomb they had in their arsenal, the 2,000 pound Enhanced Paveway III guided “bunker buster”, on the headquarters and security center.

The bombs, which are guided to their targets by lasers or GPS, are designed to bust through fortified bunkers and explode once they penetrate inside.

The MoD stated that the coalition-led mission was successful, however, they could not estimate the number of casualties.

Originally built in 1994, this particular palace contained three lakes, artificial waterfalls, and underground bunkers. Although the palace housed US troops during Operation Iraqi Freedom, it was eventually captured by ISIS forces that occupied the entire city of Mosul.